topic Re: Sort, parse and identify in QlikView

Sort, parse and identify

Thu, 12 Feb 2015 14:13:52 GMT

Hi all,

i have the following (simplified) data set:

LogInID	UserID	LogInDate	LeftPost	AnsweredPost
1	AA	2015-01-10	1	0
2	AA	2015-01-12	1	0
3	BB	2015-01-12	0	1
4	AA	2015-01-17	0	1
5	BB	2015-01-22	1	1
6	CC	2015-01-22	0	1

What i would like to do for every UserID:

Add a flag "HasAnswerAttachedToPost" = 1 to every record in my data source that tells me if a LogIn has either
- a LeftPost = 1 AND an AnsweredPost=1
- OR
- a LogIn L1 that has a LeftPost=1 AND an AnsweredPost=0 that is followed by a LogIn L2 that has LeftPost=0 AND AnsweredPost=1 within a timeframe of max 10 days after L1

This would result in:

LogInID	UserID	LogInDate	LeftPost	AnsweredPost	HasAnswerAttachedToPost
1	AA	2015-01-10	1	0
2	AA	2015-01-12	1	0
3	BB	2015-01-12	0	1
4	AA	2015-01-17	0	1	1
5	BB	2015-01-22	1	1	1
6	CC	2015-01-22	0	1

How can this be done in a smart way ?

Thanks!

Re: Sort, parse and identify

Gysbert_Wassenaar — Thu, 12 Feb 2015 14:34:35 GMT

Maybe like this:

Temp:
LOAD * INLINE [
    LogInID, UserID, LogInDate, LeftPost, AnsweredPost
    1, AA, 2015-01-10, 1, 0
    2, AA, 2015-01-12, 1, 0
    3, BB, 2015-01-12, 0, 1
    4, AA, 2015-01-17, 0, 1
    5, BB, 2015-01-22, 1, 1
    6, CC, 2015-01-22, 0, 1
];

NOCONCATENATE

Result:
LOAD *, if(AnsweredPost=1 and ( LeftPost=1 or (LeftPost=0 and LogInDate - LastLeftPost <=10)),1,0) as HasAnswerAttachedToPost;
LOAD *, if(LeftPost=1,LogInDate, if(UserID=previous(UserID), peek(LastLeftPost))) as LastLeftPost
RESIDENT Temp
ORDER BY UserID, LogInDate
;

DROP TABLE Temp;

Re: Sort, parse and identify

Thu, 12 Feb 2015 14:51:22 GMT

Here you go - Have a look at the following load script

USERDATA:
LOAD * INLINE [
LogInID, UserID, LogInDate, LeftPost, AnsweredPost
1, AA, 2015-01-10, 1, 0
2, AA, 2015-01-12, 1, 0
3, BB, 2015-01-12, 0, 1
4, AA, 2015-01-17, 0, 1
5, BB, 2015-01-22, 1, 1
6, CC, 2015-01-22, 0, 1
];

NoConcatenate
RESULT:
Load
LogInID,
UserID,
LogInDate,
LeftPost,
AnsweredPost,
if(AnsweredPost=1 and LeftPost=0,1) as HasAnsweredAttachedToPost
Resident USERDATA;

Drop Table
USERDATA;

Have Fun!!

Re: Sort, parse and identify

Fri, 13 Feb 2015 10:33:26 GMT

Thank you very much Mr. Wassenaar!

After reviewing your code and trying it on my "real" data, i stumbled over two more challanges that i am struggeling with. If you take a look at this (closer to the real) data sample:

LogInID	UserID	LogInDate	LeftPost	AnsweredPost	HasUploadedContent
1	AA	2015-01-10	1	0	0
2	AA	2015-01-12	1	0	0
3	BB	2015-01-12	1	0	0
4	AA	2015-01-17	0	1	1
5	AA	2015-01-18	0	1	1
6	BB	2015-01-12	1	0	0
7	BB	2015-01-15	0	1	1

What i would like to achieve is:

For every LogIn of a user for one day where the user has left a post, i would like to determine if this user has also answered a post and / or uploaded content either on the day of the post or within 10 days after the post. (if these login records have a LeftPost flag = 0 - in these cases i consider the original post(s) to have an answer attached and / or an upload attached.

Following the example above the my result data set would look like this:

LogInID	UserID	LogInDate	LeftPost	AnsweredPost	HasAnswerAttachedToPost	HasUploadedContent	HasContentAttachedToPost
1	AA	2015-01-10	1	0	1	0	0
2	AA	2015-01-10	1	0	1	0	1
3	BB	2015-01-12	1	0	1	0	0
4	AA	2015-01-17	0	1	Null()	0	Null()
5	AA	2015-01-21	0	1	Null()	1	Null()
6	BB	2015-01-12	1	0	1	1	1
7	BB	2015-01-15	0	1	Null()	1	Null()

I guess, the difficulties i have in particular are:

- Set the two new fields HasAnswerAttachedToPost and HasContentAttachedToPost properly in case a user has two or more LogInRecords with LeftPost=1, but AnsweredPost=0 and HasUploadedContent=0 on the same day. In that case i need to consider all of these records when checking for following LogIns of this user for potential Answer and / or Upload attachments where LeftPost = 0.

Hope, my problem is clear & thanks a lot in advance for any help, hints or suggestions!